2017.07.05 09:12
제목 : Radiative
and mechanical feedback into the molecular gas in the LMC: N159W as a test-bed
연사 : 이민영 박사님 (막스 플랑크 전파 연구소)
언어 : 영어
Abstract
The interaction between stars
and their surrounding interstellar medium (ISM) is of critical importance for
the evolution of galaxies. In this talk, I will present our investigation of
the physical properties and excitation mechanisms of the warm molecular gas in
the Large Magellanic Cloud (LMC). As a pilot study, we focused on N159W, one of
the most active star-forming regions in the LMC, and observed the target with
the Herschel SPIRE FTS, detecting CO rotational transitions up to CO(12-11).
Our radiative transfer analysis on 10 pc scales revealed the presence of very
warm (400 K) and moderately dense (1000 cm-3) molecular gas in the LMC for the
first time. In combination with other gas and dust tracers, we examined the
observed CO line ratios using state-of-the-art models of photodissociation
region (PDR) and shock, finding that mechanical heating by low-velocity shocks,
rather than ionizing sources (UV photons, X-rays, and cosmic-rays), is the
dominant heating source for CO. Finally, I will finish the talk by presenting
future work, which includes our ongoing investigation of the starbursting
30Doradus region.